Cooking and heating stove fuelled by pellet or biomass grain apt to cook and to heat water for domestic heating

ABSTRACT

Cooking and heating stove fuelled by pellet or biomass grain apt to cook and to heat water for domestic heating comprising a hearth fuelled by pellets or biomass grains, at least one plate to cook food and two heat exchangers to heat water for domestic heating wherein the cooking plate is located above the hearth fuelled by pellets or biomass grains, said two heat exchangers are positioned at the sides of the cooking plate, that on one side of said heat exchangers two inclined deflection plate are mounted that forces the combustion fumes to go up to touch the cooking plate and then to flow on the heat exchangers, the heat exchangers are two bundles with parallel pipes, on said pipes of said bundle heat exchangers at least one fixed deflection plate is located, said fixed deflection plates are perpendicular to said pipes of said bundle heat exchangers, each fixed deflection plate has a unique gateway that is positioned above or below each pipe bundle.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of PCT Application No.PCT/EP2011/060752, filed Jun. 27, 2011, which claims priority to ItalianApplication No. CZ2011A000012, filed Jun. 25, 2011 and ItalianApplication No. CZ2010A000007, filed Jun. 26, 2010.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention concerns the construction of a cooking and heatingstove fuelled by pellet or biomass grain apt to cook and to heat waterfor domestic heating.

2. Brief Description of the Related Art

Cooking and heating stoves used so far have been mainly wood stoves.Their main purpose was to heat the cooking plate or plates and toproduce small amounts of hot water.

However, there are examples of cooking stoves fuelled by pellet.GB2461580 describes a burner that feeds a stove for cooking and heatingwater. The disadvantage of such a stove is to have dimensions so largenot to allow its integration into a modular kitchen. The hot waterproduction is not enough and can not be used as a heat carrier for homeheating.

EP 1022512 describes a cooking device that uses as heat source amaterial in grains such as wood pellet with a burner and a storage tankfor the fuel. Also this cooking stove has dimensions so large not toallow its inclusion in a modular kitchen. The described cooking stovehas a heated chamber. The hot water is small and can not be used as aheat carrier for home heating. The cooking stove described does notforesee to use pipe bundle heat exchangers.

All the stoves on the market can not allow to obtain, with the samedevice, a high temperature of the cooking plate, such to allow thecooking of food and an effective water heating to be used for homeheating. Moreover, the cooking stoves on the market were too large thatthey could not be inserted into a modular kitchen, thereby complyingwith its size.

BRIEF SUMMARY OF THE INVENTION

The present invention aims to build a cooking stove that can be insertedinto a modular kitchen and such that, with the same device, can heat atleast one cooking plate and to exchange heat with at least one heatexchanger that feeds home heating. The problem that the presentinvention intends to solve is to realize a cooking stove to be insertedin a modular kitchen in which the combustion fumes are guided in orderto improve the heat transfer to the cooking plate as well as to the pipebundle heat exchanger positioned on the side of said cooking plate inorder to save space and to make possible that the cooking stove can fitin a modular kitchen. To achieve such purpose, the cooking stove objectof the present invention must have a plate directly and effectivelyheated by the fire hearth fuelled by wood pellets or other biomassmaterial in grain and a pipe bundle heat exchanger that collects heat ofcombustion fumes by passing said combustion fumes at least twice on thepipes of heat exchanger.

The main objective of the present invention is to overcome thedifficulties and drawbacks found in the solution present on the market.

The main purpose of the present invention is to produce a cooking andheating stove fuelled by pellet or biomass grain apt to cook and to heatwater for domestic heating comprising a hearth fuelled by pellets orbiomass grains, at least one plate to cook food and at least one heatexchanger to heat water for domestic heating characterized by the factthat the cooking plate/s is/are located above hearth fuelled by pelletsor biomass grains, that said heat exchanger/s is/are positioned at theside/s of the cooking plate/s, that on one side of said heat exchanger/sat least one inclined deflection plate is mounted that forces thecombustion fumes to go up to touch the cooking plate/s and then to flowon the heat exchanger/s, that the heat exchanger/s is/are a bundle withparallel pipes, that on said pipes of said bundle heat exchanger/s atleast one fixed deflection plate is located, that said fixed deflectionplate/s is/are perpendicular to said pipes of said bundle heatexchanger/s, that each fixed deflection plate has a unique gateway thatis positioned above or below each pipe bundle.

Another feature is the fact that the pipes of said bundle heatexchanger/s tube are parallel between them and all pipes are placedperpendicular to the front and back surfaces of said stove.

Another feature is the fact that the pipe bundles are two and are placedone on one side of the cooking and heating stove and one on the otherside.

Another feature is the fact that on the pipes of each bundle is mountedat least a movable plate to remove ash, deposits and also othercombustion products from the pipes.

Another feature is the fact that that the movable plates to remove ash,deposits and also other combustion products from the pipes are in numberequal to the number of fixed deflection plates plus one.

Another feature is the fact that the movable plates can be controlledfrom outside through a handle.

Another feature is the fact that in each heat exchanger is placed acollection box of ashes and other combustion products that is extractedfrom outside.

Another feature is the fact that each collection box of ashes and othercombustion products has an additional compartment located under the fanfor dust collection.

Other features and advantages of the present invention will appear clearfrom the description below of a way of creation of the present inventiongiven by way of example but not limited by the FIGS. 1, 2, 3, 4 and 5.

BRIEF DESCRIPTION OF THE DRAWINGS

For a fuller understanding of the invention, reference should be made tothe following detailed description, taken in connection with theaccompanying drawings, in which:

FIG. 1 represents a view from above of a cooking stove, object of thepresent invention.

FIG. 2 shows a cross section X-X parallel to the front surface of thecooking stove, object of the present invention

FIG. 3 represents a cross section Y-Y perpendicular to the front surfaceof a cooking stove, object of the present invention.

FIG. 4 represents an other cross section Y-Y perpendicular to the frontsurface of a cooking stove, object of the present invention.

FIG. 5 is a detail of the previous cross section Y-Y perpendicular tothe front surface of a cooking stove, object of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

Referring to FIG. 1 a top view of a cooking stove, object of the presentinvention, is shown. In this view it can be seen, in the front, acooking plate 1 and in the back the door of the pellet storage container2 and a double wall coaxial pipe 3 with the combustion air inlet 4 andoutlet of the combustion fumes 5.

With reference to FIG. 2, which shows a cross section of the cookingstove along the X-X plan, the fire hearth 6 is placed in a centralposition, in the embodiment shown in FIG. 2, said hearth 6 receives thepellets from a pipe fed by a conveyor 7 such as a screw 15. The heatproduced by the combustion of the pellets in the fire hearth 6 is forcedto go up and, for the presence on at least one side wall of at least oneinclined deflection plate 8, the combustion fumes must first flow underthe bottom surface of the cooking plate 1 and then down along theinclined deflection plates 8 to flow on the heat exchanger 10.

The combustion fumes are aspirated by a fan 12 and are forced by atleast one fixed deflection plate 9, crossed by the heat exchanger pipes10, in the embodiment represented substantially perpendicular to thepipes of the bundle heat exchanger 10, to pass at least twice on thesepipes 10 of the bundle heat exchanger for transferring heat to the watercontained in the pipes and used for domestic heating. In FIG. 3 thereare two fixed deflection plates 9 which force the combustion fumes topass three times on pipes 10. Each fixed deflection plate 9 forms aunique gateway for the combustion fumes that is positioned above orbelow each pipe bundle 10.

The pipes 10 are advantageously arranged as a parallel pipe bundle 6 ona side of the fire hearth in the direction that goes from the frontsurface to the rear surface of the cooking stoves.

This arrangement allows additional benefits. Additional movable plates11 are mounted about pipes 10 of each pipe bundle, in the embodimentrepresented in the figures movable plates are substantiallyperpendicular to these pipes, in order to remove from pipes ash,deposits as well as other combustion products. The movable plates 11 areparallel to the fixed deflection plates 9 and are equal in number to thenumber of fixed deflection plates 9 plus one. For example, if there isonly one fixed deflection plate 9, the movable plates 11 are two and ifthe fixed deflection plates 9 are two movable plates 11 are three. Themovable plates can be controlled from outside through a handle 13. Thefixed deflection plates 9 to force the combustion fumes to have apathway of combustion fumes 17 that changes direction from top to bottomor vice versa depending on the number of fixed deflection plates 9. Inthe case of FIG. 4 fixed deflection plates 9 oblige the combustion fumesthat go down to change direction and to go up for the presence of afirst fixed deflection plate 9, see first part of the pathway of thecombustion fumes 17, while in the second part of the path way ofcombustion fumes 17 the presence of a second fixed plate deflection 9obliges the fumes to change direction again causing them to go down inthe ash drawer 14 that has an additional drawer for the dust 16 throughwhich combustion fumes are aspirated by fan 12. Each fixed deflectionplate 9 has a unique pathway for the combustion fumes above or below thepipes 10 of pipe bundles and allow the change of the direction of thepathway of combustion fumes 17.

Moreover under the pipes 10 of each pipe bundle is an ash and othercombustion products collection drawer 14 that can be extracted from theoutside and helps to keep clean each heat exchanger in the example theheat exchanger is a pipe bundle, and requires the passage of smoke. Thedrawer 14, as can best be seen in FIGS. 4 and 5 also features anadditional compartment 16, which collects dust and is placed under thecombustion fumes fan 12.

In this way there can be made a cooking stove of reduced size and easeof maintain by reducing the use of skilled personnel for routinemaintenance.

The discovery, it should be noted, is not limited to the representationsgiven in the figures, but may be perfected and modified by those skilledin the art without, however, exceeding the limits of patent.

The discovery permits numerous advantages, and to overcome difficultiesthat could not otherwise have been overcome with the systems on sale atpresent.

What is claimed is:
 1. Cooking and heating stove fuelled by pellet orbiomass grain apt to cook and to heat water for domestic heatingcomprising a hearth fuelled by pellets or biomass grains, at least oneplate to cook food and at least one heat exchanger to heat water fordomestic heating characterized by the fact that the cooking plate/sis/are located above hearth fuelled by pellets or biomass grains, thatsaid heat exchanger/s is/are positioned at the side/s of the cookingplate/s, that on one side of said heat exchanger/s at least one inclineddeflection plate is mounted that forces the combustion fumes to go up totouch the cooking plate/s and then to flow on the heat exchanger/s, thatthe heat exchanger/s is/are a bundle with parallel pipes, that on saidpipes of said bundle heat exchanger/s at least one fixed deflectionplate is located, that said fixed deflection plate/s is/areperpendicular to said pipes of said bundle heat exchanger/s, that eachfixed deflection plate forms a unique gateway for the combustion fumesthat is positioned above or below each pipe bundle.
 2. Cooking andheating stove fuelled by pellet or biomass grain apt to cook and to heatwater for domestic heating according to claim 1 characterized by thefact that the pipes of said bundle heat exchanger/s tube are parallelbetween them and all pipes are placed perpendicular to the front andback surfaces of said stove.
 3. Cooking and heating stove fuelled bypellet or biomass grain apt to cook and to heat water for domesticheating according to claim 2 characterized by the fact that the pipebundles are two and are placed one on one side of the cooking andheating stove and one on the other side.
 4. Cooking and heating stovefuelled by pellet or biomass grain apt to cook and to heat water fordomestic heating according to claim 2 or 3 characterized by the factthat on the pipes of each bundle is mounted at least a movable plate toremove ash, deposits and also other combustion products from the pipes.5. Cooking and heating stove fuelled by pellet or biomass grain apt tocook and to heat water for domestic heating according to claim 4characterized by the fact that the movable plates to remove ash,deposits and also other combustion products from the pipes are in numberequal to the number of fixed deflection plates plus one.
 6. Cooking andheating stove fuelled by pellet or biomass grain apt to cook and to heatwater for domestic heating according to claim 5 characterized in thatthe movable plates can be controlled from outside through a handle. 7.Cooking and heating stove fuelled by pellet or biomass grain apt to cookand to heat water for domestic heating according to claim 1characterized by the fact that in each heat exchanger is placed acollection box of ashes and other combustion products that is extractedfrom outside.
 8. Cooking and heating stove fuelled by pellet or biomassgrain apt to cook and to heat water for domestic heating according toclaim 1 characterized that each collection box of ashes and othercombustion products has an additional compartment located under the fanfor dust collection.